Search for the doubly charmed baryon ${\Omega }_{cc}^{+}$

A search for the doubly charmed baryon ${\Omega }_{cc}^{+}$ with the decay mode ${\Omega }_{cc}^{+}\to {\Xi }_c^{+}{K}^{-}{\pi }^{+}$ is performed using proton-proton collision data at a centre-of-mass energy of 13$\mathrm{,Te\kern -0.1em V}$ collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of $5.4{\mathrm{f}\mathrm{b}}^{-1}$. No significant signal is observed within the invariant mass range of 3.6 to 4.0$\mathrm{,Ge\kern -0.1em V}/c^2$\mathrm{.}Upperlimitsaresetontheratio$R$ of the production cross-section times the total branching fraction of the ${\Omega }_{cc}^{+}\to {\Xi }_c^{+}{K}^{-}{\pi }^{+}$ decay with respect to the ${\Xi }_{cc}^{++}\to {\Lambda }_c^{+}{K}^{-}{\pi }^{+}{\pi }^{+}$ decay. Upper limits at 95% credibility level for $R$ in the range $0.005$ to $0.11$ are obtained for different hypotheses on the ${\Omega }_{cc}^{+}$ mass and lifetime in the rapidity range from 2.0 to 4.5 and transverse momentum range from 4 to 15$\mathrm{G}\mathrm{e}\mathrm{V}\mathrm{/}c$.